Do I need to report my 90-day stay in person after re-entering Thailand?

In person

Don’t use Bangkok Bank four month hold hopefully SCB will be OK

If you can’t do it online, try mailing it in, if you missed the deadline, you have to pay 2000 in person and they use half a passport page 

Yes it resets

Basically, yes, you are expected to submit the first 90-day report after arriving in person at the local immigration office. In many cases, those "first reports after entering" online submissions are rejected, but it seems some offices accept online submissions. There is no harm in trying online first within the reporting window, which is between 15 days and 7 days before the due date. If rejected, you can visit the local office to submit in person within 7 days after the due date.